Female aggression towards same-sex rivals depends on context in a tropical songbird

Behavioural Processes, Journal Year: 2022, Volume and Issue: 202, P. 104735 - 104735

Published: Aug. 20, 2022

Language: Английский

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Carotenoids‐based reddish pelvic spines in nonreproducing female and male sticklebacks ( Gasterosteus aculeatus ) – Signalling social dominance?

Ecology and Evolution, Journal Year: 2021, Volume and Issue: 11(16), P. 11038 - 11050

Published: July 8, 2021

Abstract Conspicuous ornaments are often considered a result of evolution by sexual selection. According to the social selection hypothesis, such conspicuous traits may also evolve as badges status associated with increased boldness or aggression toward conspecifics in conflicts about ecological resources. This study tested predictions from hypothesis explain red color pelvic spines three‐spine stickleback ( Gasterosteus aculeatus ). Wild nonreproducing sticklebacks were presented pairs dummies which differed at their spines, having either (i) normal‐sized gray (ii) large spines. The experimental tank was illuminated white green light, since light impedes sticklebacks’ ability detect color. moved slowly around circles each end tank. We quantified parameters two visited first, time taken before first visit dummy, (iii) distribution focal zones close and neutral zone tank, (iv) did fish eat its food‐piece, (v) spent until piece food eaten. carried out for 22 females 29 males sticklebacks. results suggested no effect size dummies’ on none five behavioral parameters. Moreover, neither themselves (as opposed redness spines) nor body length behavior dummies. Thus, this not support

Language: Английский

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Dominant females have brighter ornamentation in a sexually dimorphic lekking species

Ethology, Journal Year: 2021, Volume and Issue: 128(1), P. 85 - 93

Published: Nov. 9, 2021

Abstract Males often exhibit elaborate ornamentation that contributes to their fitness. Similarly, females can also ornamentation, but we have a relatively limited understanding of its function. Recent studies demonstrated female function in both intrasexual competition and male mate choice, few been conducted on lekking species. We therefore investigated the possibility provides information about dominance status bearer, which could mediate competition. examined this using Indian peafowl ( Pavo cristatus ), sexually dimorphic species form iridescent green neck plumage. tested whether predicts an theoretic model averaging approach. found with brighter are more socially dominant than darker ornamentation. These results suggest social bearer. This study insight into evolution conspicuous traits by suggesting potential role for

Language: Английский

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Correlated evolution of distinct signals associated with increased social selection in female white‐shouldered fairywrens

Ecology and Evolution, Journal Year: 2021, Volume and Issue: 11(23), P. 17352 - 17363

Published: Nov. 23, 2021

Abstract Conspicuous female signals have recently received substantial scientific attention, but it remains unclear if their evolution is the result of selection acting on females independently males or mutual facilitates change. Species that express female, not male, phenotypic variation among populations represents a useful opportunity to address this knowledge gap. White‐shouldered fairywrens ( Malurus alboscapulatus ) are tropical songbirds with well‐resolved phylogeny where coloration varies allopatrically across subspecies. We explored how four distinct signaling modalities, each putatively associated increased social selection, expressed in two vary competitive pressure females. Females derived subspecies M . moretoni evolved more ornamented plumage and shorter tails (a signal dominance) relative an ancestral lorentzi drab In response simulated territorial intrusions broadcasting song, both sexes aggressive coordinated mates movement vocalizations. Finally, songs complex than , song complexity does between either population. These results suggest correlated shifts tail morphology as well aggression may occurred changes intensity pressures. This highlights pressures can facilitate multimodal signals.

Language: Английский

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No evidence for an adaptive role of early molt into breeding plumage in a female fairy wren

Behavioral Ecology, Journal Year: 2019, Volume and Issue: 31(2), P. 411 - 420

Published: Nov. 24, 2019

Abstract The evolution of ornaments as sexually selected signals is well understood in males, but female ornamentation remains understudied. Fairy wrens offer an excellent model system, given their complex social structure and mating systems, the diversity ornamentation. We investigated whether early molt into ornamental breeding plumage plays adaptive role females monogamous purple-crowned fairy wren Malurus coronatus, only known to have seasonal plumage. Using 6 years monitoring, we found that timing was similar there no evidence for assortative mating. Like males (previous study), older dominant individuals acquired earlier; however, contrast did not seem be costly since unfavorable environmental conditions or previous reproductive effort delay molt. Early associated with any indicator quality nor it attract additional offspring care by partners. also association between likelihood acquiring a (breeding) position presence proximity same-sex rivals. Our study results, which are findings conspecific suggest directional selection might relaxed this species, other genetically polygamous predicts extrapair success males. However, finding status dependent raises possibility attributes ornament may fulfill function females.

Language: Английский

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